incomprehensible

Synonyms: baffling beats me beyond comprehension beyond one’s grasp clear as mud cryptic delphic enigmatic fathomless greek impenetrable incognizable inconceivable inscrutable mysterious mystifying obscure opaque over one’s head perplexing puzzling sibylline unclear unfathomable ungraspable unimaginable unintelligible unknowable

Antonyms: comprehensible fathomable intelligible understandable